/*
 * efs_vh.h
 *
 * Copyright (c) 1999 Al Smith
 *
 * Portions derived from IRIX header files (c) 1985 MIPS Computer Systems, Inc.
 */

#ifndef __EFS_VH_H__
#define __EFS_VH_H__

#define VHMAGIC		0xbe5a941	/* volume header magic number */
#define NPARTAB		16	/* 16 unix partitions */
#define NVDIR		15	/* max of 15 directory entries */
#define BFNAMESIZE	16	/* max 16 chars in boot file name */
#define VDNAMESIZE	8

struct volume_directory {
	char vd_name[VDNAMESIZE];	/* name */
	__be32 vd_lbn;		/* logical block number */
	__be32 vd_nbytes;	/* file length in bytes */
};

struct partition_table {	/* one per logical partition */
	__be32 pt_nblks;	/* # of logical blks in partition */
	__be32 pt_firstlbn;	/* first lbn of partition */
	__be32 pt_type;		/* use of partition */
};

struct volume_header {
	__be32 vh_magic;	/* identifies volume header */
	__be16 vh_rootpt;	/* root partition number */
	__be16 vh_swappt;	/* swap partition number */
	char vh_bootfile[BFNAMESIZE];	/* name of file to boot */
	char pad[48];		/* device param space */
	struct volume_directory vh_vd[NVDIR];	/* other vol hdr contents */
	struct partition_table vh_pt[NPARTAB];	/* device partition layout */
	__be32 vh_csum;		/* volume header checksum */
	__be32 vh_fill;		/* fill out to 512 bytes */
};

/* partition type sysv is used for EFS format CD-ROM partitions */
#define SGI_SYSV	0x05
#define SGI_EFS		0x07
#define IS_EFS(x)	(((x) == SGI_EFS) || ((x) == SGI_SYSV))

struct pt_types {
	int pt_type;
	char *pt_name;
};

#endif /* __EFS_VH_H__ */
